<form class="example-form">
  <mat-form-field class="example-full-width">
    <mat-label>Message</mat-label>
    <input matInput #message maxlength="256" placeholder="Ex. I need help with...">
    <mat-hint align="start"><strong>Don't disclose personal info</strong> </mat-hint>
    <mat-hint align="end">{{message.value.length}} / 256</mat-hint>
  </mat-form-field>
</form>
